<!DOCTYPE html>
<html>

<head></head>

<body>
    <form action="/user_submit?name=guest&age=10" method="post" enctype="multipart/form-data">
        name:<input type="text" name="name" value="icexmoon" /><br />
        age:<input type="text" name="age" value="12" /><br />
        file:<input type="file" name="upload"/><br />
        <input type="submit" value="submit" />
    </form>
</body>

</html>